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Discussion Starter · #1 ·
Ok so I've had my 07 Focus about a month now, I've done a few things here and there but I'm always dragging out both SAE and Metric just in case when I need to do something. And junk yarding that means more weight slugging around. Coming from the VW world all I every had to deal with was metric ( name a bolt on any pre 93 and I can prob tell you the size :p )

It seems to me metric is the standard but figure I would ask the people who have been wrenching on these things long than me. [wrenchin]
 

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^^^^ What he said... [wrenchin]
 

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^^^^
^^^^ What both the above said.

Basically all fasteners on our cars use metric sockets, except for the spark plugs (5/8") and oxygen sensors (7/8") (both those have special sockets however) and oddly a couple of the door panel or speaker screws (at least in my car 2 screws/bolts in each door were SAE headed however in one door 2 of the speaker screws were metric and 2 were SAE but they may have been mixed around at some point), and maybe some odd and end minor fastener somewhere (in my 98 Escort the CCRM module was held in place by a couple SAE headed screws when everything else except the spark plugs and oxygen sensors used metric).

However for the spark plugs despite needing a 5/8" socket they have a 14mm thread diameter and 18mm thread diameter for the oxygen senors.
 

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SAE's are often useful on rusted fasteners to fit the odd size resulting, or to get a tight fit in similar cases of tight ones.

A few sizes are close enough to use interchangeably when you need a second wrench you don't have. 13 & 1/2" are close, as are 11 & 7/16" for example (use the second combo often myself) Oh yeah, 19 & 3/4" is another one - you'll find other useful substitutes when scrambling to find something that fits in your box.
 

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I've had success with SAE for interior parts but all else is mostly metric.
 
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